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It is difficult to calculate how much activity it takes to burn off calories from a certain food, for example, how far you would have to walk to burn off a Big Mac. Although you see such calculations frequently, they are approximations. Calories burned in activity depend on the size of the individual as well as the intensity of the activity, and the calories in food depend on how much of it you eat, and sometimes even the preparation. It's better to consider overall calorie consumption and activity level plus exercise. Still, it can be fun to try to figure out the food and exercise caloric relationship. The U.S. government has a huge database of nutrients in foods, including calories. See it at www.nal.usda.gov/fnic/foodcomp. Georgia State University has posted a list of calories expended in certain activities: www2.gsu/edu/~wwwfit/physicalactivity.html#calories.